Solve the equation
Question:

For real $x$, let $f(x)=x^{3}+5 x+1$, then :-

  1. f is one-one and onto R 

  2.  is neither one-one nor onto R

  3. f is one-one but not onto R 

  4. f is onto R but not one-one


Correct Option: 1

Solution:

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